Note：the drawing does not represent the real object, just show the parameters of the pinion
Object, M0.3 9T plastic pinion, two types, interference fit 0.8mm or 1.0mm shaft, thickness 4.0mm, outside gear diameter 3.3mm, weight 0.03g.
interference fit 0.8mm shaft of 6/7mm coreless motor
or interference fit 1.0mm shaft of motor (right one below)
Weight 0.03g, with 10pcs to test